Spark-plug protector.



G. H. STUART.

SPARK PLUG PROTECTOR.

APPLIUATION FILED NOV. 13, 1906.

W/TNESSES:

PATENTED JUNE 16, 1908.

CHARLES HENRY STUART, OF NEWARK, NEW YORK.

slemmi-PLUG.v PROTECTOR.

Specification of Letters Patent.

Patented June 16, 1908.

Application led November 18, 1905. Serial No. 287,092.

To all whom it may concern:

Be it known that I, CHARLES HENRY STU- ART, a citizen of the UnitedStates, and a resident of Newark, in the county of Wayne and State ofNew York, have invented a new and Improved Spark-Plu Protector, of whichthe following is a ful'clear, and exact description.

The object of my invention is to rovide improved means for protecting sar plugs on internal combustion engines om rain, spray or other moisturewhich would tend to s ort circuit the igniting circuit and prevent aproper spark. f

The invention is especially useful in connection with spark plugs usedin boats, automobiles and in other exposed positions, and it consists incertain special features of construction which will be fully set forthhereinafter and particularly pointed out in the claims.

Reference is to be had to the accompanying drawings which illustrate asan example the referred embodiment of my invention, in w ich drawingsFigure l is a sectional view of the improvement applied to a spark plug;Fi 2 is a sectional view ofthe device etache and Fig. 3 is a bottom planview.

The body a, of the protector is preferably cylindric in form, and isconstructed of suitable insulating material, such, for example, asindurated rubber or a compound or'composition thereof. The body is openat each end, and its upper end is closed by a removably secured cap balso of insulating material. Preferably this cap is screwed into lace.Projecting-from one side of the bodylntermediate its ends is a nipple cwhich surrounds an orifice in the side of the body a, which is alsoformed of insulating material. I prefer to make this ni ple integralwith the body a. Within the bo y above said nip le is a wall orpartition.1` of metal. This is Inly seated in the body a, and is formedwith an openir o' d to receive the central electrode of the spark plug.Said wall 4is also formed with two openings d2 to receive the wire ewhich is in connection'with the spark plug.

In the use of the invention, the insulation on the conductor e is pareddown to it snugly in the nipple c and the connection between theinsulation and nipple is securel tapedto prevent the entry of moisture.T e cap b is then removed and the wire e is passed in and out through4the openings d2 to make elec-l i Athe `plate d. After this the top nutof the plug is screwed down on the late d and the ycap b of theprotector screwe over the body a. The current nowpasses from the wire eto the plate or wall d and through thesame to the central electrode ofthe plug. It should be understood that the plate d should in no case beallowed to contact with the metal body of the lug since in` this event ashort circuit wou d result. This device thorou hly incloses the plug andprevents the co lection of moisture thereon, either from rainspray orother causes, and consequently it prevents the establishment of a shortcircuit between the conductor 'e and the cylinder of the engine, whichshort" circuit would defeat the production of the spark on which theignition of the working charge of the engine depends. v

Having thus described the preferred form of my invention, what I claimas new and desire to secure by Letters Patent is:

' 1. A spark plug rotector having an insulating body, a nipp eprojecting from the side thereof, an insulating cap removably secured on'the top of the body, and a metal wall adapted to have connection withthc conductor and secured in the body intermediate its ends and havingan openlng therein to receive a part of the plug.

2. A spark plug rotector having a body of insulatin materia adapted toinclose the lug, yan a metallic member located in the body intermediateits ends and serving as a means for attaching the protector to the plugapd a connection between 'the conductor an p ug.

8. A spark plug protector having an insulating bod with an opening inits side for the passage ofytheconductor, an insulating cap removablysecured on top of the body, and a perforate metal Wall located in thebody intermediate its ends. d'

4. A spark plug rotector having a body of 4insulating materia adapted toinclose the plug, and a metallic perforate wall located in the bodyintermediate its ends, and adapted to effect connection between theconductor and the spark plug.

5. A-spark lug protector having an insuplu whereby securely to hold theprotector lation body a( apted to inclose the plug, and l 1n t(lace.means Within the body for fastening the n testimony whereof` I havesigned my same to the plug and connecting the conduoname to thisspeiication in the presence of 5 tor Wih the lplulg. h b two subscribingWitnesses.

6. s ar u roteotor avin a 0d adapted pto inlloepthe plug, andga trans)CHARLES* HENRY STUART versely extending metallic member securedWitnesses:

Within the body intermediate its ends and F. M. VAN TAssEL, 10 adaptedto be engaged with a part of the ARTHUR L. CHRISTY.

